The invention discloses blackening shampoo. The blackening shampoo is prepared from substances in parts by weight as follows: 0.1-0.2 parts of polygonum multiflorum extract, 0.04-0.08 parts of clove oil, 0.2-0.4 parts of wire drawing powder, 0.01-0.02 parts of pigment, 1-2 parts of sylvite, 0.4-0.6 parts of ketoconazole, 0.8-1.2 parts of peppermint and 80-90 parts of water. The blackening shampoohas the following beneficial effects: the blackening shampoo not only has the strong anti-dandruff effect of the conventional anti-dandruff shampoo in the market, but also has the effects of moisturizing and conditioning hair, and has a blackening function by addition of the polygonum multiflorum extract.